(Android™) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        Log.i(TAG, chilkatGlob.lastErrorText());
        return;
        }

    CkPem pem = new CkPem();

    String pemPassword = "secret";

    // To load a PEM file containing encrypted private keys, simply
    // provide the password.
    success = pem.LoadPemFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword);
    if (success != true) {
        Log.i(TAG, pem.lastErrorText());
        return;
        }

    CkFileAccess fac = new CkFileAccess();
    String pemText = fac.readEntireTextFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword);

    // To load a PEM from a string, call LoadPem instead of LoadPemFile:
    success = pem.LoadPem(pemText);
    if (success != true) {
        Log.i(TAG, pem.lastErrorText());
        return;
        }

    // A few notes:
    // The PEM may contain both private keys and certificates (or anything else).
    // The password is utilized for whatever content in the PEM is encrypted.  
    // It is OK to have both encrypted and non-encrypted content within a given PEM.

    // PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
    // methods automatically handle the different formats.
    // One format is PKCS8 and is indicated by this delimiter within the PEM:

    // -----BEGIN ENCRYPTED PRIVATE KEY-----
    // MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
    // ...

    // Another format, we'll call "passphrase" looks like this in the PEM:
    // -----BEGIN RSA PRIVATE KEY-----
    // Proc-Type: 4,ENCRYPTED
    // DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
    // 
    // paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
    // ...

    // Show the bit length of each private key:
    int i;
    int numPrivateKeys = pem.get_NumPrivateKeys();
    if (numPrivateKeys == 0) {
        Log.i(TAG, ("Error: Expected the PEM to contain private keys."));
        return;
        }

    for (i = 1; i <= numPrivateKeys; i++) {
        CkPrivateKey privKey = pem.GetPrivateKey(i - 1);
        Log.i(TAG, String.valueOf(i) + ": " + String.valueOf(privKey.get_BitLength()) + " bits");

        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}